Greenpeace director John Sauven said two journalists held in Russia for covering a protest by the environmental group had "nothing to do" with the demonstration and should be released without charge.
Freelance photojournalist Kieron Bryan was today denied bail by a Russian court.
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Groups of dairy farmers have milked supermarket shelves dry across the country in a protest against falling prices.
Seasonal rains have battered the country since late June with more than 150,000 people affected by floods and landslides.
The bus reportedly hit a tree near Russell Square.